JPH07115152A - Heat dissipating fin - Google Patents

Abstract

PURPOSE:To enhance a heat dissipating fin in cooling efficiency and to restrain a heated air from being introduced into a fan again by a method wherein a groove extending spirally from a fan container, an air inlet to a fan, and a lid which seals up the spiral groove provided in a fin are provided. CONSTITUTION:Leads 12 connected to a board are planted upright in one surface of a heat releasing part 11 such as an LSI or the like mounted on the board, and a fin mounting region 13 is disposed on the other heat dissipating surface of the heat releasing part 11. A fin 1 mounted on the fin mounting region 13 of the part 11 is provided with a fan container 4 located nearly at its center and a groove 2 which extends spirally towards an exhaust vent located outside the fan container 4. A well-known sirocco fan 5 is housed in the fan container 4. The sirocco fan 5 is housed in the fan container 4 of the fin 1, and a lid 7 provided with an air inlet which is located at its center and serves as an air feed hole to the sirocco fan 5 is so mounted as to seal up the groove 2 of the fin 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiating fin, and particularly to a heat generating component having a large heat generation amount among heat generating components such as LSI mounted on a printed circuit board. The present invention relates to a radiation fin for cooling spotwise.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS.
The fin 51 is attached to the heat radiating surface of the heat-generating component 50, and the axial fan 54 is attached at the tip 51a of the fin 51 and near the approximate center of the heat-generating component.

In the figure, 52 is a lead for joining to a substrate (not shown), 53 is a cover for protecting the bare chip mounted inside, and 55 is a motor which is a drive part of an axial fan. .

As shown by the arrow, the cool air taken in from the axial fan 54 passes through the blades of the axial fan 54 to cool the bottom surface 51b of the fin 51 and the fin portion standing from the bottom surface, and then the outside of the fin 51. It was configured to be discharged to.

[0005]

However, in the conventional structure, as shown in FIG. 5, it cannot be said that the space through which the cool air from the axial fan 54 passes is short and the fins are sufficiently cooled. Since the cold air passing through 51 passes through the open space, there is a drawback that warm air is re-engaged and enters the axial fan 54 as indicated by an arrow 56.

Therefore, it is an object of the present invention to provide a heat radiating fin capable of sufficiently cooling a heat generating component and reducing the amount of warm air entering the fan again.

[0007]

The above object is to provide a heat-generating component 1.
A fan housing portion 4 formed at the center of the heat radiation surface of the fan housing 1, a groove 2 spirally formed from the fan housing portion 4, and an exhaust portion 10 formed at the end of the groove 2. A fin 1 having a fan, and a fan 5 that is housed in the fan housing portion 4 and discharges air in the centrifugal direction from the center thereof.
A heat radiating fin having an intake port 9 to the fan 5 and a lid 7 for sealing the spiral groove 2 formed in the fin 1; 2. The radiating fin according to claim 1, which is a sirocco fan, and the spiral groove 2 formed in the fin 1 has different widths depending on the formation position. Alternatively, it can be achieved by the radiation fin described in 2.

[0008]

That is, according to the present invention, since the cool air discharged from the fan passes through the spiral groove formed in the fin, the route through which the cool air passes is extended, and the area for heat exchange can be expanded. Cooling efficiency is improved.

Furthermore, the warm air is discharged only from the exhaust portion formed at the end of the groove, and the possibility of the heated air being re-wound into the fan is reduced by the lid that seals the groove.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a side view of the assembly. FIG. 3 is a diagram showing a sirocco fan. FIG. 4 is a diagram showing the flow of wind in this embodiment.

1 to 4, the same reference numerals denote the same objects. Figure 1
As shown in FIG. 3, a heat-generating component 11 such as an LSI mounted on a board (not shown) has one surface on which leads 12 for joining to the board are planted, and the other surface, the heat dissipation surface, is indicated by a broken line. The fin mounting area 13 is arranged as shown.

The fin 1 to be mounted in the fin mounting area 13 has a fan housing portion 4 formed substantially in the center thereof, and a spiral groove extending from the fan housing portion 4 toward the exhaust portion 10 formed outside. 2 is formed.

A well-known sirocco fan 5 is housed in the fan housing portion 4 of the fin 1. The sirocco fan 5 will be briefly described. As shown in FIG. 3, a motor 15 is attached to the center of the sirocco fan 5. By rotating the inner rotating body 20 and the outer rotating body 19, respectively, the air is exhausted in the centrifugal direction from the center of the fan through the slit 22 formed in the side surface of the outer rotating body 19.

With the sirocco fan 5 accommodated in the fan accommodating portion 4 of the fin 1, at least the groove of the fin 1 is provided with a lid 7 formed around an intake port 9 serving as a supply port of air to the sirocco fan 5. 2 is attached so as to be sealed.

Screw holes 3 provided at four corners of the fin 1,
Similarly, the screw holes 8 provided at the four corners of the lid 7 are aligned with each other and fastened and fixed by the screws 6. As shown in FIGS. 2 and 4, the fin 1 assembled as described above takes in cool air from the intake port 9 at the center of the lid 7 attached to the fin 1, and the sirocco fan 5 moves the wind to the center. Is discharged from only the exhaust portion 10 formed at the end of the groove 2 while spirally rotating along the groove 2 in the centrifugal direction.

Reference numeral 17 in FIG. 2 is exhaust gas discharged from the exhaust portion 10 formed at the end of the groove 2 formed with the fin 1, and 14 is for protecting a bare chip (not shown) mounted on the back surface of the heat-generating component. Is the cover of.

Further, as shown in FIG. 4, the width of the groove 2 formed in the fin 1 differs depending on its position. That is,
This is because wind is exhausted from the sirocco fan 5 in the centrifugal direction from the center, so that interference with the wind passing through the groove 2 is reduced.
The relationship between the widths is as follows: the width α of the position of the central side portion of the sirocco fan 5 and the width β of the position of the outer side portion on the centrifugal side thereof.
Are in the relationship of α <β.

According to the present embodiment, since the cold air passes through the spiral groove 2 formed in the fin 1 while rotating, the route through which the cool air passes is extended and the area for exchanging heat radiation is expanded.

[0020]

As described above, according to the present invention, since the cool air passes through the spiral groove in the fin while rotating, the route through which the cool air passes is extended and the area for heat exchange is expanded. In addition, the air exhausted from the groove is exhausted from one place of the exhaust part, and the groove is sealed by the lid, so that the reduction of wind entrainment is reduced, heat exchange is sufficiently performed, and cooling efficiency is improved. Has the effect that can be realized.

By realizing the cooling efficiency, the fin itself can be downsized.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is an assembled side view.

FIG. 3 is a diagram showing a sirocco fan.

FIG. 4 is a diagram showing the flow of wind in the present embodiment.

FIG. 5 is a diagram showing a conventional example.

FIG. 6 is a top view of a conventional example.

[Explanation of symbols]

 1 fin, 2 groove, 4 fan storage part, 5 fan (sirocco fan), 7 lid, 9 intake port, 10 exhaust part, 11 heat generating parts,

Claims (3)

[Claims] 1. A fan accommodating portion (4) which is attached to a heat radiating surface of a heat generating component (11) and is formed at the center thereof.
A groove (2) spirally formed from the fan housing (4), and an exhaust part (1) formed at the end of the groove (2).
0), a fan (5) that is housed in the fan housing part (4) and discharges air in the centrifugal direction from its center, and an intake port (9) to the fan (5). And a lid (7) for sealing the spiral groove (2) formed in the fin (1), and a radiating fin. 2. The radiating fin according to claim 1, wherein the fan (5) is a sirocco fan. 3. The radiating fin according to claim 1, wherein the width of the spiral groove (2) formed in the fin (1) is different depending on the position where the spiral groove (2) is formed.